472351e13d
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270 lines
6.7 KiB
Groff
.\" $NetBSD: login_cap.3,v 1.13 2003/04/16 13:35:14 wiz Exp $
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.\"
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.\" Copyright (c) 1996,1997 Berkeley Software Design, Inc. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Berkeley Software Design,
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.\" Inc.
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.\" 4. The name of Berkeley Software Design, Inc. may not be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" BSDI login_cap.3,v 1.4 1997/11/07 16:22:27 jch Exp
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.\"
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.Dd January 13, 2000
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.Dt LOGIN_CAP 3
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.Os
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.Sh NAME
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.Nm login_getclass ,
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.Nm login_getcapbool ,
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.Nm login_getcapnum ,
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.Nm login_getcapsize ,
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.Nm login_getcapstr ,
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.Nm login_getcaptime ,
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.Nm login_close ,
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.Nm setclasscontext ,
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.Nm setusercontext
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.Nd query login.conf database about a user class
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In sys/types.h
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.In login_cap.h
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.Ft login_cap_t *
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.Fn login_getclass "char *class"
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.Ft int
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.Fn login_getcapbool "login_cap_t *lc" "char *cap" "u_int def"
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.Ft quad_t
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.Fn login_getcapnum "login_cap_t *lc" "char *cap" "quad_t def" "quad_t err"
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.Ft quad_t
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.Fn login_getcapsize "login_cap_t *lc" "char *cap" "quad_t def" "quad_t err"
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.Ft char *
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.Fn login_getcapstr "login_cap_t *lc" "char *cap" "char *def" "char *err"
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.Ft quad_t
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.Fn login_getcaptime "login_cap_t *lc" "char *cap" "quad_t def" "quad_t err"
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.Ft void
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.Fn login_close "login_cap_t *lc"
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.Ft int
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.Fn setclasscontext "char *class" "u_int flags"
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.Ft int
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.Fn setusercontext "login_cap_t *lc" "struct passwd *pwd" "uid_t uid" "u_int flags"
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.Sh DESCRIPTION
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The
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.Fn login_getclass
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function extracts the entry specified by
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.Ar class
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(or
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.Li default
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if
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.Ar class
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is NULL or the empty string)
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from
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.Pa /etc/login.conf
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(see
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.Xr login.conf 5 ) .
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If the entry is found, a
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.Li login_cap_t
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pointer is returned.
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NULL is returned if the user class is not found.
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When the
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.Li login_cap_t
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structure is no longer needed, it should be freed by the
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.Fn login_close
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function.
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.Pp
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Once
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.Ar lc
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has been returned by
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.Fn login_getclass ,
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any of the other
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.Fn login_*
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functions may be called.
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.Pp
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The
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.Fn login_getcapnum ,
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.Fn login_getcapsize ,
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.Fn login_getcapstr ,
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and
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.Fn login_getcaptime
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functions all query the database entry for a field named
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.Ar cap .
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If the field is found, its value is returned.
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If the field is not found, the value specified by
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.Ar def
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is returned.
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If an error is encountered while trying to find the field,
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.Ar err
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is returned.
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See
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.Xr login.conf 5
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for a discussion of the various textual forms the value may take.
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The
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.Fn login_getcapbool
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function is slightly different.
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It returns
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.Ar def
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if no capabilities were found for this class (typically meaning that
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the default class was used and the
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.Li /etc/login.conf
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file is missing).
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It returns a non-zero value if
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.Ar cap ,
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with no value, was found,
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zero otherwise.
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.Pp
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The
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.Fn setclasscontext
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function takes
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.Ar class ,
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the name of a user class,
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and sets the resources defined by that class according to
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.Ar flags .
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Only the
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.Dv LOGIN_SETPATH ,
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.Dv LOGIN_SETPRIORITY ,
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.Dv LOGIN_SETRESOURCES ,
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and
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.Dv LOGIN_SETUMASK
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bits are used.
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(See
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.Fn setusercontext
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below).
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It returns 0 on success and -1 on failure.
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.Pp
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The
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.Fn setusercontext
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function
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sets the resources according to
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.Ar flags .
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The
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.Ar lc
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argument, if not NULL, contains the class information that should
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be used.
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The
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.Ar pwd
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argument, if not NULL, provides information about the user.
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Both
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.Ar lc
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and
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.Ar pwd
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cannot be NULL.
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The
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.Ar uid
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argument is used in place of the user id contained in the
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.Ar pwd
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structure when calling
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.Xr setuid 2 .
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The various bits available to be or-ed together to make up
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.Ar flags
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are:
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.Bl -tag -width LOGIN_SETRESOURCESXX
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.It LOGIN_SETGROUP
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Set the group id and call
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.Xr initgroups 3 .
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Requires the
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.Ar pwd
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field be specified.
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.It LOGIN_SETLOGIN
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Sets the login name by
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.Xr setlogin 2 .
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Requires the
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.Ar pwd
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field be specified.
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.It LOGIN_SETPATH
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Sets the
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.Ev PATH
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environment variable.
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.It LOGIN_SETPRIORITY
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Sets the priority by
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.Xr setpriority 2 .
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.It LOGIN_SETRESOURCES
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Sets the various system resources by
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.Xr setrlimit 2 .
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.It LOGIN_SETUMASK
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Sets the umask by
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.Xr umask 2 .
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.It LOGIN_SETUSER
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Sets the user id to
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.Ar uid
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by
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.Xr setuid 2 .
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.It LOGIN_SETENV
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Sets the environment variables as defined by the setenv keyword, by
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.Xr setenv 3 .
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.It LOGIN_SETALL
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Sets all of the above.
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.El
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.Sh SEE ALSO
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.Xr setlogin 2 ,
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.Xr setpriority 2 ,
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.Xr setrlimit 2 ,
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.Xr setuid 2 ,
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.Xr umask 2 ,
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.Xr initgroups 3 ,
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.Xr secure_path 3 ,
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.Xr login.conf 5
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.Sh HISTORY
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The
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.Nm
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family of functions are largely based on the
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.Bsx
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implementation of same, and appeared in
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.Nx 1.5
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by kind permission.
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.Sh CAVEATS
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The string returned by
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.Fn login_getcapstr
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is allocated via
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.Xr malloc 3
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when the specified capability is present and thus it is the responsibility
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of the caller to
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.Fn free
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this space.
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However, if the capability was not found or an error occurred and
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.Fa def
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or
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.Fa err
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(whichever is relevant) are non-NULL the returned value is simply what
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was passed in to
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.Fn login_getcapstr .
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Therefore it is not possible to blindly
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.Fn free
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the return value without first checking it against
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.Fa def
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and
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.Fa err .
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.Pp
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The same warnings set forth in
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.Xr setlogin 2
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apply to
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.Fn setusercontext
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when the
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.Dv LOGIN_SETLOGIN
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flag is used.
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Specifically, changing the login name affects all processes in the current
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session, not just the current process.
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See
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.Xr setlogin 2
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for more information.
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